Colorless, White, Colorless, Greenish, Brown, White, Colorless, Greenish, Brown, White, Colorless, Greenish, Brown
White, Colorless, Blue, Red, Green, Yellow, Violet
Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)
Not Available
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
SiO 2Ulrich Henn and Claudio C.
Vitreous, Silky, Pearly, Waxy
Not Available